JPH09199347A - Sheet transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin type sheet transformer in which stable electric performance is obtained with respect to a sheet transformer used for electric equipment. SOLUTION: A first coil 12a is formed by winding a conductor in a spiral form, a second coil 12b is successively wound on the outer circumferential part on the same plane in a spiral form similarly to the first coil 12a, the coil part is formed so that the positions of lead-out parts 13a, 13b do not overlap each other, and a magnetic core 11 is assembled thereinto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat transformer used for various electric devices.

[0002]

2. Description of the Related Art In recent years, the frequency of transformers has been increasing with the aim of downsizing and thinning, and in the coil portion, a coil formed by winding a conductor wire in a spiral shape to reduce the thickness, or a spiral punched with a thin conductor plate. The coil can be configured with a small number of turns,
Thin sheet transformers have been developed that have the same type or a combination of the coils and are laminated.

FIG. 3 shows a conventional seat transformer.
Will be described with reference to a side sectional view. According to the figure, 1 is an EE type or EI type magnetic core, 2a to 2c are respective coils formed by winding a conductive wire in a spiral shape, and 3a to 3c are respective lead portions of the coils 2a to 2c.

The structure of the above-described conventional seat transformer will be described below. First, a coil portion is formed by sequentially stacking each of the coils 2b and 2a so that the lead-out portion 3c is arranged on the coil 2c formed by spirally winding a conductive wire, and finally, the magnetic core 1 is incorporated to form a sheet transformer. There is.

[0005]

However, in the above-mentioned conventional structure, when the conductive wires are spirally stacked and stacked, even if the coil has a small number of turns, the stacking height of the coil inevitably increases if the number of layers increases. Furthermore, depending on the thickness of the lead-out part, the thickness of one layer of spiral coil is equivalent to two layers.
It was an obstacle to thinning. Further, when the number of turns of the coil is 1 turn or less, there is a problem that it is very difficult to configure the coil independently and to position the coil.

The present invention solves the above-mentioned conventional problems. Even if the number of layers of a coil in which a conductive wire is spirally wound is increased, the stack height is low and the overall thickness of the coil portion can be reduced. It is an object of the present invention to provide a sheet transformer having high dimensional accuracy and stable electric performance even with a coil having a small number of turns.

[0007]

In order to solve the above-mentioned problems, a sheet transformer of the present invention comprises a first coil in which at least a conductive wire is spirally wound on the same plane, and the first coil.
And a second coil continuously wound in the same plane on the outer circumference of the coil in a spiral shape.
And the position of the lead portion of the second coil is different.

With the above structure, since the first and second coils are formed on the same plane to reduce the stacking height of the coils and the positions of the lead-out portions of the respective coils are made different, they do not overlap each other, Since each lead-out portion is pulled out within the thickness of one layer, the transformer as a whole can be made thin. Further, the first coil located on the inner side is positionally regulated by the second coil on the outer side even with a small number of turns, and stable electric performance can be obtained.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is such that at least a first coil in which a conductive wire is spirally wound on the same plane is continuous with the same plane on the outer periphery of the first coil. And the second coil wound in a spiral shape, and the lead-out portions of the first and second coils are located at different positions, so that the first and second coils are formed on the same plane. In addition to reducing the stacking height of the coils, the positions of the draw-out parts of each coil are different so that they do not overlap, and the draw-out parts are drawn out within the thickness of one coil, so the transformer as a whole is thin. Is what you can do.

According to a second aspect of the present invention, the first coil having the structure of the first aspect has one turn or less. Since the second coil is wound around the outer circumference, the first coil has one turn or less. Even if the number of turns is low, the coil is formed and functions as a coil.

According to a third aspect of the present invention, at least one of the coil of the sheet transformer according to the first or second aspect is a self-bonding wire. It is a product that can be reliably regulated and have stable electrical characteristics.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 is a top view of an embodiment of a seat transformer of the present invention, and FIG. 2 is a side sectional view. According to the figure, 11 is a magnetic core made of EE type or EI type ferrite, 12a and 12b are coils formed by spirally winding a conductive wire, and 13a and 13b are the coils 12 described above.
The drawing parts of a and 12b are shown.

According to this embodiment, first, the first coil 12a is formed by winding a conductive wire in a spiral shape, and the outer periphery of the first coil 12a on the same plane is followed by another second coil 12a.
Like the first coil 12a, the coil 12b is sequentially wound in a spiral shape, and the magnetic core 11 is assembled by forming coil portions in which the positions of the lead portions 13a and 13b are shifted so as not to overlap each other. According to this configuration, the coils 12a and 12b are wound on the same plane,
The stacking height can be reduced without increasing the bottom area of the coil, and the position of the first coil 12a can be easily regulated to obtain stable electric performance. Drawer 1
Since the lead-out portions do not overlap with each other, the thicknesses of 3a and 13b can be suppressed to the thickness of one coil layer, and the thickness of the entire coil portion can be reduced.

Further, even if the position of the first inner coil 12a cannot be restricted by itself within one turn or less, the position can be restricted by the second outer coil 12b, so that the first coil 12a can function as a coil. is there.

When at least one coil wound in a spiral shape uses a self-bonding wire, the conventional configuration does not have a function of retaining the shape, so that the coil cannot be formed, but it is the same as other coils. Since the coil is wound around the inner and outer peripheral portions on the plane and fused, the position of the coil can be reliably defined.

The same effect can be obtained by using a flat conductor wire as the conductor wire.

[0017]

As described above, according to the sheet transformer of the present invention, at least the first coil wound spirally on the same plane.
And a second coil wound spirally continuously on the same plane of the outer periphery of the first coil, and the positions of the lead portions of the first and second coils are different. Since it is located, the seat transformer can be provided as a thin type.

[Brief description of drawings]

FIG. 1 is a top view of a seat transformer according to an embodiment of the present invention.

FIG. 2 is a sectional side view of the same.

FIG. 3 is a side sectional view of a conventional seat transformer.

[Explanation of symbols]

 11 magnetic core 12a first coil 12b second coil 13a (first coil) lead-out portion 13b (second coil) lead-out portion

Claims (3)

[Claims] 1. A first coil in which at least a conductor wire is spirally wound on the same plane, and a second coil which is continuously spirally wound on the same plane on the outer periphery of the first coil. A sheet transformer that is configured and has different positions of the lead-out portions of the first and second coils. 2. The sheet transformer according to claim 1, wherein the first coil has one turn or less. 3. The sheet transformer according to claim 1, wherein at least one of the first and second coils is a self-bonding wire.